[Snyk] Upgrade @dynatrace/barista-icons from 7.17.0 to 7.21.1

[snyk-bot]

Snyk has created this PR to upgrade @dynatrace/barista-icons from 7.17.0 to 7.21.1.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 5 versions ahead of your current version.
• The recommended version was released a month ago, on 2022-06-02.

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[dynatrace-cla-bot]

All committers have signed the CLA.